Balanced Audio Technology VK-85 Preamplifier

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Nyhet Balanced Audio Technology VK-85

The VK-85 Preamplifier is the result of a new design strategy that benefits from several improved in-house circuit
technologies, including the aforementioned “SuperPak Quattro” and the “Second Generation Transformer Coupled
Outputs”, as well as proven BAT circuits such as Unistage Design, High-Current N-Channel MOSFET Circuit and Shunt
Volume Control.
The new “SuperPak Quattro” dramatically lowers the VK-85 preamplifier’s overall noise floor while the new “Second
Generation Transformer Coupled Outputs” results is a highly open and dynamic sound, free of both the sonic and
longevity drawbacks common to capacitor coupled designs. While all BAT preamplifiers use transformer coupled outputs,
what is used in the VK-85 is on a whole new level of premium output transformer design.
Unistage Design in a preamplifier serves the purpose of maintaining the integrity of the input signal. In the VK-85, this is
achieved using only one gain stage - one free from the negative artifacts attributable to both extremes of modern
preamplifier design: passive preamplifiers and multi-stage buffered active circuits. BAT’s trademarked Unistage circuit
provides the ultimate simplicity of amplifying the incoming signal just once while using no global feedback to double-back
on the integrity of that signal. This continues to be a hallmark of BAT’s purist approach to circuit topology.
The VK-85 circuit is based on High-Current N-Channel MOSFET devices where both sides of the waveform are handled
by identical devices – in identical circuit configuration – assuring symmetry of the resulting signal, just as described for
the REX 300. The highly accurate volume control employs a proprietary electronic shunt volume attenuator with 140
steps of 0.5dB resolution. This is accomplished using a single Vishay bulk foil resistor – the most precise and thermally
stable resistor available – per phase; This is all that’s in the signal path. Discrete metal film resistors are used to bleed the
unused signal to ground. The 140 steps give precise repeatable volume settings that sound continuous to the human ear.
Lastly, but of paramount importance for the VK-85 and REX 300 - and all prior BAT models over the past 30 years – is the
reasoning behind using fully balanced circuits. BAT firmly believes that balanced is better because it simply provides a

complete signal representation; Something very magical occurs when the limitations of a single-ended circuit with its half-
signal processing is lifted from an audio component and replaced by a balanced circuit topology. Aside from the well

established benefits of signal integrity for long interconnect cable runs there are other benefits to balanced circuitry: As a
circuit becomes more symmetrical, the residual effect of the power supply becomes less intrusive - the demand on a
power supply becomes less taxing - so it becomes easier to design a balanced circuit that conforms more closely to the
engineering ideal. For added convenience and compatibility with source components the VK-85 incorporates a mix of
balanced and single-ended inputs and outputs.
BAT VK-85 Preamplifier Significant Design Features:
 Fully balanced design circuit topology
 Revised power supply incorporates BAT’s new fourth-generation SuperPak topology
 Second-Generation Transformer-Coupled Outputs
 Unistage Design with a single gain stage
 High-Current N-Channel MOSFET Circuit
 Noise (unweighted): -96dB / THD @ 2V output: 0.01%
 Inputs: 3 XLRs and 2 RCAs / Outputs: “Main” 2 XLRs and “Tape Out” 1 RCA
 Proprietary electronic shunt volume attenuator with 140 steps of 0.5dB resolution
 Frequency Response: 2Hz to 200kHz / Maximum Gain: 20dB
 Dimensions (w x h x d): 19" x 5.75" x 15.5" / Weight: 40 lbs
To summarize, the result of all of this aforementioned engineering excellence in the VK-85 preamplifier and REX-300
power amplifier is pure musicality, midrange clarity, perfect linearity, power and dynamics that have made Balanced
Audio Technology one of the most respected brands in high-performance audio.

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Veil. pris BAT VK 85 pre. 168 000 kr.
Ta kontakt for pristilbud !
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www.NordicSoundDesign.no
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